In June 2015 I set of goal of learning the Rosary in Latin. I gave myself one year. I wanted to think in Latin. I fond that repetition worked when I attempted to learn any language. You may become saturated by monotony, but you will need to press through if you wish to become fluent.

I found an unused copy of Rosetta Stone's Latin course - basically unused with headphones and so forth on eBay for $33. I also found a copy of Wheelock's Latin 7th Edition* by using ISBNS.com http://www.isbns.net/ search engine. That helped tremendously.

A helpful site on the Internet is Thesaurus Precum Latinarum. I found it when searching on Google. I consider it the most user-friendly and comprehensive site on the Rosary anywhere. That's just my experience, and I don't have the final word on it.